Each milligram of glucose has the same amount of energy available to do work. the series b test tubes produced more bacteria per milligram of glucose than did the series a test tubes. assuming that each bacterium produced requires a certain amount of energy, which test tube should contain some products of glucose that still contain some "unused" energy?

The series A test tube has some left amount of glucose left in it.

Explanation:

Let's assume that a fixed amount of glucose is synthesized, for the fixed quantity the bacteria produced in A and B be x and y respectively,

Therefore, the condition on x and y is,    y > x  as the no. of bacteria present in B is greater.

As a result B would require a greater amount of energy for its functioning, these energy would be derived from the already fixed amount of glucose present.

A test tube would also require the energy for its x number of bacteria, but it is less than that of B.

Therefore, there would be some unused glucose left in Test Tube Series A which has unused energy.

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its c its is a mixture of gases